Hello there,
The DAF owners club will be able to answer your question on wether you DAF is tax exempt or not. They have the chassis number of the last DAF 66 produced in 1972, so can provide you with a certificate to confirm if your car was produced prior to Jan 1973.
This will be provided free if you are a member of the club, there is a charge of £30 pounds to a non-member. I hear cries of that's a bit steep, but it's only the same cost of joining the club for a year.
It's taken nearly 10 years to track down this information. So we are try to use this information to benefit the club and it's members.
www.dafownersclub.co.uk